most other possible earths in the universe are million and billions of light years away.
We have been sending signals into space since the 1950's. So, those signals have only
traveled 65 light years.
So, I don't think anyone knows we are even here!
Also, seems pretty rediculous that they would travel for millions of years, in their little space capsule, just
to hover in the night sky over Indiana for 15 minutes, then go home!